Index matched grating inscription
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[0025]Gratings are often inscribed onto an optical fiber by exposing photosensitive regions of the optical fiber, such as the core, to an interference pattern of actinic radiation (e.g., ultraviolet (UV) light). As shown in FIG. 1B, the optical fiber is often cylindrical in shape. Thus, when an actinic beam irradiates the optical fiber from a direction that is transverse to the cylindrical axis, such as that shown in FIGS. 1A and 1B, the curvature of the optical fiber causes focusing of the UV light, as shown in FIG. 1B. This phenomenon, known as lensing, results in undesirable intensity variations within the optical fiber. For example, as shown in FIG. 1B, when an actinic beam 24 irradiates a multi-core fiber 14, depending on the configuration of the cores within the multi-core fiber 14, the actinic beam 24 may irradiate some cores 18 but wholly avoid other cores 19 due to the lensing effect. As one can appreciate, lensing can be even more complicated in fibers that do not have a c...
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